CVE-2025-50464
📋 TL;DR
A pre-authentication buffer overflow vulnerability in iptime NAS firmware allows attackers to execute arbitrary code by sending specially crafted HTTP requests to the upload.cgi module. This affects all users running the vulnerable firmware version without requiring authentication. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- iptime NAS devices
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise, data theft, ransomware deployment, or creation of a persistent backdoor.
Likely Case
Remote code execution allowing attackers to gain shell access, install malware, or pivot to other network systems.
If Mitigated
Denial of service or system crash if exploit attempts are blocked or fail.
🎯 Exploit Status
Public proof-of-concept code exists demonstrating the vulnerability. The exploit requires sending a specially crafted HTTP request with a long CONTENT_TYPE header.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check iptime vendor website for firmware updates. If available, download and apply the latest firmware version following vendor instructions.
🔧 Temporary Workarounds
Block upload.cgi access
linuxUse firewall rules or web server configuration to block access to the vulnerable upload.cgi endpoint.
iptables -A INPUT -p tcp --dport 80 -m string --string "upload.cgi" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "upload.cgi" --algo bm -j DROP
Network segmentation
allIsolate iptime NAS devices from untrusted networks and restrict access to authorized IPs only.
🧯 If You Can't Patch
- Disable the NAS web interface if not required for operations
- Implement strict network access controls allowing only trusted IP addresses to communicate with the NAS
🔍 How to Verify
Check if Vulnerable:
Check firmware version via NAS web interface or SSH if enabled. Version 1.5.04 is vulnerable.Check Version:
Check via web interface at http://[nas-ip]/ or SSH command if availableVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.5.04.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to upload.cgi with unusually long CONTENT_TYPE headers
- Multiple failed authentication attempts followed by upload.cgi access
- System crash or restart logs
Network Indicators:
- HTTP POST requests to /upload.cgi with CONTENT_TYPE headers exceeding 8 characters
- Unusual outbound connections from NAS device
SIEM Query:
source="nas_logs" AND (uri="/upload.cgi" AND content_length>100) OR (uri="/upload.cgi" AND http_user_agent="curl" OR http_user_agent="wget")